Which category do you need? - The main purpose of sunglasses is to cut out light that could otherwise damage your sensitive eyes. In order to inform the customer sunglass lenses are categorised from 0 to 4, 4 are the darkest and cut out the most light, 0 are often transparent (but can have a slight tint), they cut out no light. For mountain use you should use Category 4 for high mountain ridges in clear conditions or snow and at least Category 3 for valleys with less direct sunlight. Some lenses are photo-chromic, they react to the light conditions and move from Category 3 to Category 4 and vice versa as the conditions dictate. For a fuller discussion of categories:... READ MORE. Some design features cut out light as well, such as a wrap around styles or removeable side hoods. Pros and Cons of Lens Material? - there are four materials used to make lenses for sunglasses and they each have their pros and cons, except perhaps for Acrylic which has to many cons to be useful in all but casual use sunglasses (poor durability & clarity with some image distortion) - we don't stock them.
Lens Colour (Tint)? - The most common lens colour (tint) is Brown, this is because these lenses (along with Grey and Green) are 'colour neutral', that is they cut down on overall brightness without distorting colours thereby accentuating relief. |
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